Residual markings from steel stock?
			 
			 
			
		
		
		
			
			Prof. Briggs (plate XXI b) illustrates (from the literature) a blade with markings that I suspect originated as stampings on European sheet steel later cut and shaped to be a blade. Does your blade appear to be fully forged, or is it, like some kaskara I have, likely due to stock removal. 
 
I believe I have a takouba with similar markings and I shall begin to work through the pile and see if I can find and photograph it.
		 
		
		
		
			
		
		
		
		
		
		
		
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